package com.bwie.fifter;

import com.alibaba.cloud.commons.lang.StringUtils;
import io.jsonwebtoken.Jwts;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.annotation.Order;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.util.concurrent.TimeUnit;

@Configuration
@Order(1)
public class MyGlobalFifter implements GlobalFilter {
    @Autowired
    StringRedisTemplate redisTemplate;

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        String path = request.getURI().getPath();
        if(path.contains("login")){
            return chain.filter(exchange);
        }

        String token = request.getHeaders().getFirst("token");
        if(StringUtils.isEmpty(token)){
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        Integer userId = Jwts.parser().setSigningKey("bwie").parseClaimsJws(token).getBody().get("userId", Integer.class);
        String key = "token-" + userId;
        String redisToken = redisTemplate.opsForValue().get(key);
        if(StringUtils.isEmpty(redisToken)){
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        if(!redisToken.equals(token)){
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        redisTemplate.expire(key,60, TimeUnit.MINUTES);

        return chain.filter(exchange);
    }
}
